Desert Varnish is intended for cotton rag and matte prints, not for coated papers. What about Juniper Baryta Rag? I've searched the support forum and FAQs but don't see a pointer.

We don’t recommend using the Desert Varnish on Juniper Baryta, there could be issues due to the satin surface. For non matte papers lamination is often the best option if you need surface protection and don’t plan to use glass.